P5MCFF1 Separating wall and roof with insulation at rafter level

Build Up

Party Masonry Cavity Wall

Separating Wall and Roof

2 x Leaves Lightweight Blockwork Party (Separating) Wall

Cavity fully filled with insulation

150mm insulation (λ = 0.044W/mK) between the rafters

50mm (λ =0.022W/mK) below the rafters